Less concern with normality for large sample sizes
Equal variances (homescedascity)
Compare the box part of the box plots
Look for large disparities only (2 or 3 fold)
Calculate and compare the standard deviations
Again, large disparities only
Levene’s test (not recommended)
Too little power for small sample sizes
Too much power for large sample sizes
Very sensitive to normality assumption
Independence
Assessed qualitatively
Independence between groups
No matching
No longitudinal measures
Independence within groups
No cluster effects
No infectious spread
Housing data dictionary, 1 of 5
source:
This file was found originally at a website
DASL (Data And Story Library) that is no
longer available.
description:
The original source describes the data as
"a random sample of records of resales of
homes from Feb 15 to Apr 30, 1993 from the
files maintained by the Albuquerque Board
of Realtors. This type of data is
collected by multiple listing agencies in
many cities and is used by realtors as an
information base."
Housing data dictionary, 2 of 5
copyright:
Unknown. You should be able to use this data for
individual educational purposes under the Fair Use
guidelines of U.S. copyright law.
format:
delimiter: space
varnames: first row of data
missing-value-code: *
rows: 117
columns: 8
Housing data dictionary, 3 of 5
vars:
Price:
label: Selling price
unit: dollars
SquareFeet:
label: Living space
unit: square feet
AgeYears:
label: Age of home
unit: years
Housing data dictionary, 4 of 5
NumberFeatures:
label:
Home features (dishwasher, refrigerator,
microwave, disposer, washer, intercom,
skylight(s), compactor, dryer, handicap
fit, cable TV access)
scale: count
range: 0 to 11
Northeast:
label: Located in northeast sector of city?
values:
Yes: 1
No: 0
